Question

 Antiparticle of electron is

(a)  

(b)   

(c) Positron

(d) Neutrino

Answer

(c) Positron

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Similar questions

A nucleus moving with a velocity $\vec{\text{v}}$ emits an α-particle. Let the velocities of the α-particle and the remaining nucleus be $\vec{\text{v}}_1$ and $\vec{\text{v}}_2$ and their masses be m1 and m2.

  1. $\vec{\text{v}},\ \vec{\text{v}}_1$ and $\vec{\text{v}}_2$ must be parallel to each other.

  2. None of the two of $\vec{\text{v}},\ \vec{\text{v}}_1$ and $\vec{\text{v}}_2$ should be parallel to each other.

  3. $\vec{\text{v}}_1+\vec{\text{v}}_2$ must be parallel to $\vec{\text{v}}.$

  4. $\text{m}_1\vec{\text{v}}_1+\text{m}_2\vec{\text{v}}_2$ must be parallel to $\vec{\text{v}}.$

Ohm's law is true

(a) For metallic conductors at low temperature

(b) For metallic conductors at high temperature

(c) For electrolytes when current passes through them

(d) For diode when current flows

In Young's double slit experiment when wavelength used is 6000 Å and the screen is 40 cm from the slits, the fringes are 0.012 cm wide. What is the distance between the slits

(a) 0.024 cm

(b) 2.4 cm

(c) 0.24 cm

(d) 0.2 cm

In a compound microscope magnification will be large, if the focal length of the eye piece is

(a) Large                                            

(b) Smaller 

(c) Equal to that of objective

(d) Less than that of objective

Which of the following phenomenon can explain quantum nature of light:

The bottom of a container filled with liquid appear slightly raised because of

(a) Refraction

(b) Interference

(c) Diffraction

(d) Reflection

Complete the reaction

(a)  

(b)  

(c)  

(d)    

Which represents NAND gate

(a)

(b)

(c)

(d)

Let r be the distance of a point on the axis of a magnetic dipole from its centre. The magnetic field at such a point is proportional to:
  1. $\frac{1}{\text{r}}$
  2. $\frac{1}{\text{r}^2}$
  3. $\frac{1}{\text{r}^3}$
  4. None of these.

Two point charges (+Q)  and (-2Q) are fixed on the X-axis at positions a and 2a  from origin respectively. At what positions on the axis, the resultant electric field is zero

(a) Only x =  

(b) Only x = - 

(c) Both x = ± 

(d) x =  only